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Robert Haas 16a4e4aecd Extend the ProcSignal mechanism to support barriers. ... A new function EmitProcSignalBarrier() can be used to emit a global barrier which all backends that participate in the ProcSignal mechanism must absorb, and a new function WaitForProcSignalBarrier() can be used to wait until all relevant backends have in fact absorbed the barrier. This can be used to coordinate global state changes, such as turning checksums on while the system is running. There's no real client of this mechanism yet, although two are proposed, but an enum has to have at least one element, so this includes a placeholder type (PROCSIGNAL_BARRIER_PLACEHOLDER) which should be replaced by the first real client of this mechanism to get committed. Andres Freund and Robert Haas, reviewed by Daniel Gustafsson and, in earlier versions, by Magnus Hagander. Discussion: http://postgr.es/m/CA+TgmoZwDk=BguVDVa+qdA6SBKef=PKbaKDQALTC_9qoz1mJqg@mail.gmail.com		6 years ago
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buffer	Extend the ProcSignal mechanism to support barriers.	6 years ago
file	Add safeguards for pg_fsync() called with incorrectly-opened fds	6 years ago
freespace	Split all OBJS style lines in makefiles into one-line-per-entry style.	6 years ago
ipc	Extend the ProcSignal mechanism to support barriers.	6 years ago
large_object	Split all OBJS style lines in makefiles into one-line-per-entry style.	6 years ago
lmgr	Make the order of the header file includes consistent in backend modules.	6 years ago
page	Make the order of the header file includes consistent in backend modules.	6 years ago
smgr	Fix mdsyncfiletag(), take II.	6 years ago
sync	Make the order of the header file includes consistent in backend modules.	6 years ago
Makefile	Refactor the fsync queue for wider use.	6 years ago